Hi there!
You might have noticed that the forums appear a bit lacking activity wise.
Don't worry though! We haven't vanished and there's a very simple explanation for this, namely Discord.
Most of us have more or less migrated to the above-mentioned multifunctional social platform.
This is where you'll find the daily gossip, gaming talk, funny videos and memes, well, just about anything, really!
Check out this thread if you want to know more:

Nice to hear that!
What do you play nowadays?
I'll mention Discord again where you'll find most of us hanging around on a frequent basis.
Great place to interact with everyone!
Link: http://revolucion.me/discord

You might want to hold off on purchasing any of the base operators until the new update is out!
Source: https://www.gamespot.com/articles/some-rainbow-six-siege-operators-are-going-free-so/1100-6456847/
More info on Operation Chimera/patch notes: https://rainbow6.ubisoft.com/siege/en-GB/game-info/seasons/chimera/index.aspx

It's still in its early stages of development, but here's a couple of gameplay videos from the pre-alpha:
Info video about what's coming:
Kickstarter page: https://www.kickstarter.com/projects/blackmatter/hell-let-loose